static int master_slave_detect(void)
{
    char message[50];

    /* master? */
    SET_REG(ATA_SELECT, 0);
    snprintf(message,50,"ATA_STATUS:%08x",ATA_STATUS);
    sleep(5);
    if ( ATA_STATUS & (STATUS_RDY|STATUS_BSY) ) {
        ata_device = 0;
        DEBUGF("Found master harddisk\n");
    }
    else {
        /* slave? */
        SET_REG(ATA_SELECT, SELECT_DEVICE1);
        if ( ATA_STATUS & (STATUS_RDY|STATUS_BSY) ) {
            ata_device = SELECT_DEVICE1;
            DEBUGF("Found slave harddisk\n");
        }
        else
            return -1;
    }
    return 0;
}